Looking for Melos triode 200+ schematics

[zigo3]

Hello
I own a Melos triode 200 plus stero and I have problemas with one output (noises and distorsions) and when the problems began the powamp produce a terrible burning smell. It seems a transistor burning smell.
I'm looking for the schematics, but "Melos audio restoration" is closed, Melos audio is closed too.
Please somebody have the schematics?
Thankyou very much in advance
Roberto

[zigo3]

This is the amp we are talking about

[zigo3]

And this is the back opened with the pcb

[zigo3]

In appearance there are 3 areas where appear a patch. It seems an oil patch, maybe from the capacitors

[zigo3]

.

[zigo3]

If the ouptup problem born from that, and anyway, the schematic would be very useful to understand what is happening and how this capacitors or the oil patches can be connected with the transistor burning smell.

[kevinkr]

Originally posted by zigo3
And this is the back opened with the pcb

On the front left side there appear to be two capacitors with bulging tops which might indicate that they are failing and about to vent. The metal tops underneath the plastic insulating disks should be completely flat if they are not failing. Replace with higher voltage/ higher temperature parts if this is the case.

Unfortunately I do not have a schematic for any Melos products.

On the schematic front you may end up having to trace this thing out yourself unless some good person has the schematic. Even though Melos is gone the original schematic may still be copyright and probably should not be posted here without attempting to get permission first.

[zigo3]

Originally posted by kevinkr



On the front left side there appear to be two capacitors with bulging tops which might indicate that they are failing and about to vent. The metal tops underneath the plastic insulating disks should be completely flat if they are not failing. Replace with higher voltage/ higher temperature parts if this is the case.

Unfortunately I do not have a schematic for any Melos products.

On the schematic front you may end up having to trace this thing out yourself unless some good person has the schematic. Even though Melos is gone the original schematic may still be copyright and probably should not be posted here without attempting to get permission first.

Thankyou very much Kevin. I will try removing those capacitors, even if they seem "born" in this way.

I can understand that there can be a copyright on the schematics, but what can I think about a society who don't support in no way his clients? The only official laboratory was in USA (think; ship a 90lbs powamp from europe to USA and return only to repair it...) and now is more that one year that it is closed.
I think that if exist a copyright law would must exist a law who impose to publish the schematics if there are no way to repair a product by the owners of the schematics.
By the way I would be happy to pay for them: it would be absolutely cheaper that give the amp to an unauthorized lab and ask "do what you can"...

thanks for your help.
rob

[Seraph]

<On the front left side there appear to be two capacitors with bulging tops which might indicate that they are failing and about to vent.>

You have excellent eyes!

Roberto, electrolytics smell bad when they are on the verge of venting. The two caps could well be the offenders. Hope you have verified this and the amp is back in operation by now. I am sure you'd check out other caps as well.

Good luck

[kevinkr]

Originally posted by zigo3


Thankyou very much Kevin. I will try removing those capacitors, even if they seem "born" in this way.

I can understand that there can be a copyright on the schematics, but what can I think about a society who don't support in no way his clients? The only official laboratory was in USA (think; ship a 90lbs powamp from europe to USA and return only to repair it...) and now is more that one year that it is closed.
I think that if exist a copyright law would must exist a law who impose to publish the schematics if there are no way to repair a product by the owners of the schematics.
By the way I would be happy to pay for them: it would be absolutely cheaper that give the amp to an unauthorized lab and ask "do what you can"...

thanks for your help.
rob

Hi Rob,
I totally agree, what I meant that they should probably not be published on the forum - if someone has them and can email them to you there should be no issue. May not be an issue anyway if no one cares to enforce the copyright..